/*
 * $Id$
 *
 * SARL is an general-purpose agent programming language.
 * More details on http://www.sarl.io
 *
 * Copyright (C) 2014-2024 SARL.io, the Original Authors and Main Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *------- FORKED SOURCE CODE:
 *
 * THIS CODE IS FORKED FROM JDK.JAVADOC INTERNAL PACKAGE AND ADAPTED TO THE SARL PURPOSE.
 * THE FORK WAS NECESSARY BECAUSE IT IS IMPOSSIBLE TO SUBCLASS THE TYPES FOR THE.
 * STANDARD HTML DOCLET THAT IS PROVIDED BY JDK.JAVADOC MODULE.
 *
 * Copyright (c) 2003, 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package io.sarl.docs.doclet2.framework;

import java.util.Collections;
import java.util.regex.Pattern;

import com.google.common.base.Strings;

/** Parser of description of custom tags. 
 *
 * @author $Author: sgalland$
 * @version $FullVersion$
 * @mavengroupid $GroupId$
 * @mavenartifactid $ArtifactId$
 * @since 0.13
 */
public class CustomTagParserImpl implements CustomTagParser {

	private static final Pattern FULL_PATTERN = Pattern.compile("^([^:]+):([^:]+:):([^:]+)$"); //$NON-NLS-1$
	
	private static final Pattern SIMPLE_PATTERN = Pattern.compile("^([^:]+)$"); //$NON-NLS-1$

	@Override
	public CustomTag parse(String customTagDescription, CustomTagLocation defaultLocation, String defaultHeader) {
		if (customTagDescription != null) {
			final var matcher0 = FULL_PATTERN.matcher(customTagDescription);
			if (matcher0.matches()) {
				final var name = matcher0.group(1);
				if (!Strings.isNullOrEmpty(name)) {
					final var locations = CustomTagLocation.parse(matcher0.group(2));
					if (!locations.contains(CustomTagLocation.DISABLED)) {
						if (locations.isEmpty()) {
							locations.add(CustomTagLocation.EVERYWHERE);
						}
						final var header = Strings.nullToEmpty(matcher0.group(3));
						return new CustomTag(name, locations, header);
					}
				}
			} else if (defaultLocation != null) {
				final var matcher1 = SIMPLE_PATTERN.matcher(customTagDescription);
				if (matcher1.matches()) {
					final var name = matcher1.group(1);
					if (!Strings.isNullOrEmpty(name)) {
						final var allLocations = defaultLocation == CustomTagLocation.EVERYWHERE ? CustomTagLocation.getAllActiveLocations() : Collections.singletonList(defaultLocation);
						return new CustomTag(name, allLocations, defaultHeader);
					}
				}
			}
		}
		return null;
	}

}
